The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 18, 2011
Filed:
May. 21, 2008
Andreas Hille, Loerrach, DE;
Florian Felix Kneisel, Frankfurt, DE;
Volker Hamm, Bad Saeckingen, DE;
Matthias Rochnia, Ortenberg-Bleichenbach, DE;
Andreas Hille, Loerrach, DE;
Florian Felix Kneisel, Frankfurt, DE;
Volker Hamm, Bad Saeckingen, DE;
Matthias Rochnia, Ortenberg-Bleichenbach, DE;
Evonik Degussa GmbH, Essen, DE;
Abstract
Provided is a pyrogenically prepared SiOpowder in the form of aggregated primary particles having a statistical thickness surface area (STSA) of 10-500 m/g, a thickening action based on the STSA of 4-8 mPas·g/m, and a micropore volume of 0.03-0.07 cm/g, and a process for preparing the pyrogenic SiOpowder, which involves: introducing hydrolyzable silicon compounds, a primary gas comprising oxygen, and a primary combustion gas into a mixing chamber to produce a mixture; igniting the mixture in a burner to produce a flame, which is burned into a reaction chamber to produce the pyrogenic SiOpowder and gaseous substances; and separating the pyrogenic SiOpowder from the gaseous substances, wherein a ratio of the amount of primary combustion gas introduced to a stoichiometric amount of primary combustion gas required is referred to as gammaand has a value of less than 1, and wherein a ratio of the amount of primary gas comprising oxygen introduced to a stoichiometric amount of primary gas comprising oxygen required is referred to as lambdaand has a value of greater than 1.